''The Unknown Quantity'' was a 1919 American silent directed by

Thomas R. Mills Thomas R. Mills, billed as Tom Mills, was an actor and director of silent films. He was a theater actor until he joined Vitagraph to make films. He was born in Headcorn, Kent, England. Filmography Actor * '' The Making Over of Geoffrey Manning ...

produced and distributed by the Vitagraph Company of America. It is based on the 1910

short story A short story is a piece of prose fiction that typically can be read in one sitting and focuses on a self-contained incident or series of linked incidents, with the intent of evoking a single effect or mood. The short story is one of the oldest ...

of the same name by

O. Henry William Sydney Porter (September 11, 1862 – June 5, 1910), better known by his pen name O. Henry, was an American writer known primarily for his short stories, though he also wrote poetry and non-fiction. His works include "The Gift of the M ...

.Alan Globe, ed.
''The Complete Index to Literary Sources in Film''
(Bowker-Saur) 1999, 999.The Unknown Quantity
at the American Film Institute: Catalog of Feature Films

Plot

A profiteer's son falls in love with one of his father's victims and secures the acquittal of her brother who was falsely accused of murder.

Cast

* Corinne Griffith - Mary Boyne *

Huntley Gordon Huntley Ashworth Gordon (October 8, 1879 – December 7, 1956) was a Canadian actor who began his career in the Silent Film era. Profile Gordon was born in Montreal, Quebec, educated in both Canada and England. He had various jobs including w ...

- Dan Kinsolving *

Harry Davenport Harry Davenport may refer to: * Harry Davenport (actor) (1866–1949), American film and stage actor * Harry Davenport (footballer) (1900–1984), Australian footballer * Harry J. Davenport (1902–1977), Democratic Party member of the U.S. House ...

- Septimus Kinsolving * Jack Ridgeway - Thomas Boyne * Frederick Buckley - Peter Kenwitz * Jack McLean - Sammy Boyne

References

External links

* American black-and-white films Vitagraph Studios films 1919 films American silent feature films Lost American films American silent short films Adaptations of works by O. Henry 1910s American films 1919 lost films {{short-silent-film-stub